Canon ew 83g lens hood for ef28 300mm f35 56l is usm
Canon ew83g for ef28 300mm f35 56 l is usm lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens in addition since the end of the lens is extended you also get the added benefit of some extra protection from accidental impact dedicated lens hoods are designed to match the specific focal length of the lens it was designed for